Luminescent spectroscopy of lead tungstate crystals doped with europium ions

摘要

Spectral-luminescent properties of the lead tungstate crystals doped with the Eu~(3+) ions were investigated in a wide temperature range at different excitation and registration wave lengths. The spectra consist of both weak wide nonstructural bands of the matrix emission and narrow spectral lines caused by inner f-f electron transitions in the impurity Eu~(3+) ions. The analysis and interpretation of spectral lines observed in excitation and luminescence spectra have shown formation of at least two different types of luminescent centers on the basis of the Eu~(3+) ions in the PbWO_4 crystals. These two types of centers are considered as caused by arrangement of the impurity Eu~(3+) ions in Pb sites as well as in W sites of the host matrix.